A peer-reviewed open-access journal ZooKeys 625: 1–10 (2016) Two new Habronattus jumping spiders 1 doi: 10.3897/zookeys.625.9891 RESEARCH ARTICLE http://zookeys.pensoft.net Launched to accelerate biodiversity research Two new jumping spider species of the Habronattus clypeatus group (Araneae, Salticidae, Harmochirina) Wayne P. Maddison1, David R. Maddison2 1 Beaty Biodiversity Museum and Departments of Zoology and Botany, University of British Columbia, 6270 University Boulevard, Vancouver, British Columbia, V6T 1Z4, Canada 2 Department of Integrative Biology, Oregon State University, Corvallis, OR 97331, USA Corresponding author: Wayne P. Maddison ([email protected]) Academic editor: J. Miller | Received 16 July 2016 | Accepted 26 September 2016 | Published 19 October 2016 http://zoobank.org/10F78C45-40E6-4579-A2A6-FCAD624B576F Citation: Maddison WP, Maddison DR (2016) Two new jumping spider species of the Habronattus clypeatus group (Araneae, Salticidae, Harmochirina). ZooKeys 625: 1–10. doi: 10.3897/zookeys.625.9891 Abstract Two species of the Habronattus clypeatus species group are described, Habronattus arcalorus sp. n. from Texas and Colorado, and Habronattus gilaensis sp. n. from New Mexico. Habronattus arcalorus males have extravagant ornamentation: a green first leg with an unusually dense lateral fringe of orange and white hairs, and a large grey triangular patella on the third leg with blue-white scales nearby. Habronattus gilaensis males are considerably more muted, lacking ornamentation on the third leg’s patella and tibia. Photographs of living specimens are given, as well as notes on habitat. Keywords Araneae, Salticidae, Salticinae, Plexippini, Harmochirina, jumping spider Introduction The genus Habronattus F.O. Pickard-Cambridge, 1901 includes jumping spiders whose males have remarkably complex courtship displays, especially the members of a large clade with modified first and third legs (Peckham and Peckham 1890; Griswold 1987; Elias et al. 2003, 2012). Within this clade, the first leg of most males is laterally fringed with modified setae, and the third femur, patella and tibia have several modifications Copyright W. P. Maddison and D. R. Maddison. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 2 Wayne P. Maddison & David R. Maddison / ZooKeys 625: 1–10 (2016) of apophyses, swellings, tufts, and colours. This clade contains 38 described species (Griswold 1987) divided into three species groups, of which the clypeatus species group is restricted to the southwestern United States and Mexico. We here describe two new species of the clypeatus group, one of which has some of the most exaggerated courtship ornamentation known in Habronattus. These two species were referred to in molecular phylogenetic and chromosome studies by the names “Habronattus sp. (CNCTY)” and “Habronattus cf. dossenus” (Maddison and Hedin 2003; Maddison and Leduc-Robert 2013), and are the current focus of continuing behavioural and molecular studies. Methods Preserved specimens were examined under both dissecting microscopes and a com- pound microscope with reflected light. Drawings were made with a drawing tube on a Nikon ME600L compound microscope. All specimens are deposited in the Spencer Entomological Museum of the University of British Columbia (UBC-SEM), except for paratypes deposited (as noted) in the AMNH (American Museum of Natural His- tory), MCZ (Museum of Comparative Zoology, Harvard University) or OSAC (Or- egon State Arthropod Collection, Oregon State University, Corvallis). Terms are used in standard fashion for Araneae. The descriptions were written with primary reference to the focal specimen indicated, which was used for measure- ments and carefully checked for details, but they apply as far as known to the other specimens examined. All measurements are given in millimeters. Carapace length was measured from the base of the anterior median eyes (AME) not including the lenses to the rear margin of the carapace medially; abdomen length to the end of the anal tubercle. Positions on the bulb of the male palp (left, ventral view) are described using hours of an analog clock’s face. The following abbreviations are used: ALE, anterior lateral eyes; PLE, posterior lateral eyes; PME, posterior median eyes (the “small eyes”). The Habronattus clypeatus species group The eight described species of this group can be distinguished from one another by their male third legs (Figs 1–9) as well as other features. The group is distinctive for having the male clypeus with vertical-oblique dark bands descending from the AME, the basal white band of the abdomen divided by one or two longitudinal medial dark bands, and (usually) a medial longitudinal dark band on the underside of the abdomen. The ret- rolateral tibial apophysis appears as a hook in ventral view. In addition, in living males of the clypeatus group a pattern of dark spots is visible when the observer looks into the AMEs, consisting of an array of dark pigment patches (see, for example, this video: https://www.youtube.com/watch?v=Dq5ky7vjPYo). It is possible that all Habronattus have such a pigmentation pattern in the eyes, but that it has been observed only in the clypeatus group because the broad depigmented areas on the thorax let in light. Two new Habronattus jumping spiders 3 Figures 1–9. Third legs of males of described species in theHabronattus clypeatus species group. Left legs shown, except Figs 1, 2, 7, 9 which show digitally-flipped images of right legs. 1 H. dossenus Griswold, 1987, from U.S.A.: Arizona: Cochise Co.: Lower Turkey Creek, Chiricahua Mts, 109.42°W, 31.85°N, 2 H. clypeatus (Banks, 1895) (montane form), from U.S.A.: Arizona: Jack’s Canyon near Flagstaff 3 H. cl- ypeatus (desert form), from U.S.A.: Arizona: Pima Co.: Santa Catalina Mts., Molino Basin, Prison Camp road 4 H. velivolus Griswold, 1987, from México: Jalisco: Laguna Sayula, 19.9963°N, 103.5522°W 5 H. formosus (Banks, 1906), from U.S.A.: California: Inyo Co.: Bishp 6 H. forticulus (Gertsch & Mulaik, 1936), from U.S.A.: Texas: Travis Co., Austin, 30.25°N, 97.71°W 7 H. californicus (Banks, 1904), from U.S.A.: California: San Diego Co.: Oceanside, 33.27°N, 117.44°W 8 H. divaricatus (Banks, 1898), from México: Baja California Sur: near La Laguna trailhead, San Juan del Aserradero 9 H. aztecanus (Banks, 1898), from México: Nayarit: San Blas. All photos credit W. P. Maddison. Species boundaries in the group are not entirely clear. Habronattus clypeatus (Banks, 1895) has two forms, a montane form in most of its range, dark and with the third femur swollen and orange terminally (Fig. 2), and a smaller paler form from the deserts of southern Arizona whose third femur is less modified (Fig. 3). The desert form appears to intergrade with H. formosus (Banks, 1906) (Fig. 5), with the third leg’s patella becoming more red and swollen moving west from Phoenix to Yuma. Most recognized species are parapatric or allopatric, but there is at least one case of sympatry: H. dossenus Griswold, 1987 and H. clypeatus in southern Arizona, where they can co- occur in the same small habitat. In such situations, apparent hybrids – male specimens that blend the ornaments of both species – can be found occasionally. The two species described here are distinctive, without any known intergradation with other forms. 4 Wayne P. Maddison & David R. Maddison / ZooKeys 625: 1–10 (2016) Results Habronattus arcalorus Maddison & Maddison, sp. n. http://zoobank.org/479C8BE5-6F5D-470E-9ECC-2F63175C6159 Figs 10–21 Holotype. Male in UBC-SEM, with labels: “TEXAS: Jeff Davis Co.: Davis Moun- tains State Park 103.939°W, 30.593°N, 22-23 April 1997 Maddison/Hedin/Hebets WPM#97-001” and “♂W167”. Paratypes (5♂♂ 3♀♀). 1♂ (specimen W328) 1♀ (specimen W332) in UBC- SEM; 1♂ 1♀ in AMNH; 1♂ 1♀ in MCZ; 2♂ in OSAC; all with same data as holotype. Etymology. The name is an arbitrary combination of letters, including the syllable “arc”, included to evoke the rainbow of colors in the male ornaments. Diagnosis. The large triangular patella of the third leg of males is distinctive in sal- ticids. Habronattus viridipes (Hentz,1846) has a triangular patella also (Griswold 1987: figure 99), but it is different from that of H. arcalorus in colour (orange-yellow with a black spot, rather than grey) and in having a terminal apophysis. Habronattus cali- fornicus (Banks, 1904), also of the clypeatus group, has a triangular patella (Griswold 1987: figure 107), but the patella is smaller and yellow and red. H. arcalorus also differs from H. californicus in having green first legs with a much denser fringe. Females ofH. arcalorus are distinctive from most specimens of other clypeatus group species in having a distinct black triangle on the thorax (Figs 19-20). Note. This species was referred to by Maddison and Hedin (2003) as H. sp. (CNCTY) (and possibly also H. sp. (CHIH); see note below on Chihuahuan form). Molecular data suggest that H. arcalorus and H. forticulus (Gertsch & Mulaik, 1936) are outside the clade containing the bulk of the clypeatus group species – H. azte- canus (Banks, 1898), H. californicus (Banks, 1904), H. clypeatus, H. divaricatus (Banks, 1898), H. dossenus, H. formosus, and H. velivolus Griswold, 1987. H. arcalorus and H. forticulus are the easternmost representatives of the clypeatus group. Description. Male (focal specimen: holotype, specimen W167). Carapace length 2.3; abdomen length 2.3. Structure of chelicerae, legs, and body typical for Habro- nattus and the clypeatus group. Palp (Figs 10, 11) standard for the clypeatus group (Griswold 1987 figures 180, 181, 203), with the embolus arising at about 3:00 and the basal portion of the terminal apophysis pointing to 6:00. The tibial apophysis is hooked from ventral view (Fig.